Staff failed to disclose billing

I recently took a cellphone contract with telkom, specifically told the telkom staff member that i've never had a contract so she must try and be frank with me, signed the contract of which i knew i'd be paying R299 per month, i almost fainted when i saw a bill of R1194. 81 when i went there the gentleman was not helpful either, he kept on telling me i shud've reduced the limit to R1, told him no one told me about the limit, he never did anything,tried contacting the call centre tried making an arrangement coz i knew i wont have that amount on my account for the debit order, was given a case for the arrangement to pay atleast R500 but still they took the whole amount.... I so regret taking that contract with them, thought i was dealimg with professionals but i guess not.